A217735 a(n) = the least positive integer m such that n^3 + m^3 is a square, or 0, if (presumably) there is no such m.

2, 1, 0, 8, 0, 0, 21, 4, 18, 65, 37, 0, 0, 70, 0, 32, 0, 9, 0, 0, 7, 26, 1177, 0, 50, 22, 0, 84, 0, 0, 0, 16, 88, 450, 665, 72, 11, 1178, 0, 260, 0, 0, 0, 148, 0, 2, 0, 0, 98, 25, 0, 0, 0, 0, 0, 65, 112, 0, 0, 0, 0, 0, 189, 128, 10, 0, 0, 0, 0, 14, 0, 36, 0, 0, 0, 0, 0, 273, 0, 0, 162, 0, 0, 28, 0, 602, 0, 33, 0, 585, 65, 4708, 0, 0, 1121

Offset: 1

Author

Zak Seidov, Mar 22 2013

Keywords

• nonn

Comments

All zero terms are suggestive(?). All positive terms are certain.

Examples

			n=1: 1^3+2^3=3^2
n=2: 2^3+1^3=3^2
n=4: 4^3+8^3=24^2
n=7: 7^3+21^3=98^2
		

Links

• Giovanni Resta, Table of n, a(n) for n = 1..1000 (see comments in b-file)

Crossrefs

Cf. A103254 (values of n such that a(n) > 0).